15.比1.02的2倍还多0.6的数是多少?正确列式是( )
A. | (1.02+0.6)×2 | B. | 1.02×2+0.6 | C. | 1.02+0.6×2 |
14.得数是1的算式是( )
A. | 0.5÷0.4×0.5÷0.4 | B. | (0.5÷0.4)×(0.5÷0.4) | C. | 0.5÷(0.4×0.5÷0.4) | D. | (0.5÷0.4×0.5)÷0.4 |
13.口算
2.5÷20= | 9.6÷3.2= | 0.45×2= | 8-3.5= | 0.3×2.5= |
7.5÷0.25= | 0.2-0.09= | 4×0.25= | 0.37+0.3= | 1÷0.1×1÷0.1= |
12.直接写出得数.
0 161202 161210 161216 161220 161226 161228 161232 161238 161240 161246 161252 161256 161258 161262 161268 161270 161276 161280 161282 161286 161288 161292 161294 161296 161297 161298 161300 161301 161302 161304 161306 161310 161312 161316 161318 161322 161328 161330 161336 161340 161342 161346 161352 161358 161360 161366 161370 161372 161378 161382 161388 161396 199269
0.075+0.125= | 8.1÷0.03= | 401×2.5= | 2.5×0.7×0.8= |
12-6.2-3.8= | 0.25×16= | 90-4.063= | (1.5+0.25)×4= |